JPS63303751A - Ink jet recording device - Google Patents

Abstract

PURPOSE:To prevent air from being sucked into an ink jet nozzle by providing an ink induction piece on the ink supply port side of an ink chamber and also providing a piezoelectric ceramic for the ink induction piece which presses and vibrates the ink induction piece on the external wall of a corresponding point. CONSTITUTION:A printer head is composed of a pressure plate 1, a nozzle plate 2, a supply plate 3, a bypass plate 4, a tank plate 3 and a blind plate 6 joint in that order. When the printer head is driven, ink is inducted into an ink chamber 10 from an ink fountain through an ink induction port 8. An ink induction piece 14 vibrates like a fan via a vibrating piece 13 by constant driving, at fixed frequency, of a piezoelectric ceramic attached adhesively to a piezoelectric ceramic-glued part 9 for the ink induction piece. Subsequently, ink in the ink chamber 10 is continuously supplied to an ink supply port at a fixed pressure. Then ink supplied to a pressure chamber 12 is ejected by the action of the piezoelectric ceramic attached adhesively to a piezoelectric ceramic-glued part for ejection 7. Consequently, a predetermined pressure can always be applied to an ink flying direction and thereby the suction of air from an ink jet nozzle be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording device that is one of non-impact recording methods, and more particularly to an inkjet recording device having a unique structure for a printer head that ejects ink.

[Prior Art] Generally, as shown in FIG. 2, an inkjet recording apparatus is composed of a printer head 15 and an ink reservoir 18 that supplies ink 17 to the printer head 15 via a vibrator 16. The generator 19 selectively drives the piezoelectric ceramics 20 to change the pressure chamber volume of the printer head 15 to eject ink droplets 21 from the tip of the printer head 15 to print on the print paper 22.

Conventionally, the printer head of this type of inkjet recording apparatus has a pressure plate 23, a nozzle plate 24, a supply plate 25, and a bypass plate 2, as shown in FIG.
6, a tank plate 27 and a blind plate 28 are sequentially joined, and has an ink jetting principle as shown in FIGS. 4 and 5.

That is, the upper outer wall of the pressure chamber 29 is bent by the action of the piezoelectric ceramic 20 to which a voltage is applied under the control of the pulse generator 19, and the pressure chamber 2 supplied from the ink supply port 30 is bent.
Pressure is applied to the ink in the ink 9, and this pressure causes the ink droplets 21 to be ejected from the ink jet ports 31. A bypass 32 is also provided within the pressure chamber 29 to assist in the supply of ink.

[Problems to be Solved] In the conventional inkjet recording apparatus described above, ink is ejected and supplied only by the deflection of the pressure chamber 29 and the bypass 32. It has the disadvantage that it is extremely difficult to inhale it.

That is, after ink is ejected, the pressure chamber 29 expands due to the reaction as shown in FIG. 6, and the ink liquid level 33 recedes, and if this operation is repeated, air bubbles will eventually remain in the ink path. Become.

If air bubbles remain in the ink path, air is compressible and will absorb the energy of ink ejection, resulting in poor ink ejection.

Also, as a way to remove air remaining in the ink path,
One possible method is to suck up ink and air from the ink jet port 31 using a vacuum pump. However, with this method, when the vacuum pump is suctioning, the state is the same as when ejecting ink, as shown in Figure 5, but the moment the vacuum pump is stopped, the sixth
As shown in the figure, there is a drawback that the pressure chamber 29 swells and air is sucked into the ink path.

[Means for solving problems] The present invention has been made in order to solve the above-mentioned problems of the conventional art. In the inkjet recording apparatus, the ink is supplied to the ink chamber, and includes a printer head that ejects the ink in the pressure chamber from the ink jet port by bending the outer wall of the pressure chamber by piezoelectric ceramics controlled by a pulse generator. An ink introduction piece that swings like a fan is provided on the supply port side, and a piezoelectric ceramic for ink introduction that presses and swings the ink introduction piece is provided on the outer wall of the ink chamber corresponding to the ink introduction part. The present invention provides an inkjet recording device.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a printer head of an inkjet recording apparatus according to an embodiment of the present invention.

The printer head consists of pressure plate 1 and nozzle plate 2.
, a supply plate 3, a bypass plate 4, a tank plate 5, and a blind plate 6 are sequentially joined.

The pressure plate 1 includes a plurality of piezoelectric ceramic bonding parts 7 for bonding piezoelectric ceramics for ink injection controlled by a pulse generator, an ink introduction port 8 for introducing ink from an ink reservoir, and a pulse generator. It has a piezoelectric ceramic bonding section 9 for an ink introduction piece to which a piezoelectric ceramic for an ink introduction piece controlled by the generator is bonded.

An ink chamber 10 is formed by joining the nozzle plate 2, supply plate 3, bypass plate 4, and tank plate 5.
is configured. Further, the nozzle plate 2 is connected to the ink chamber 1.
0 through an ink supply port 11, and a vibrating piece 13 provided at a location corresponding to the ink introduction port 8 of the ink chamber 10. The supply plate 3 has a fan-shaped ink introduction piece 14 in the ink chamber. Due to the action of the ceramics, it swings like a fan toward the ink supply port 11 via the vibrating piece 13. The bypass plate 4 has a bypass 15 connected to the pressure chamber 12 with the supply plate 3 interposed therebetween.

Next, the operation of this embodiment will be explained.

When the printer head is driven, ink is introduced from the ink reservoir into the ink chamber 10 through the ink introduction port 8. The ink in the ink chamber 10 is generated by constantly driving the piezoelectric ceramic bonded to the ink introduction piece piezoelectric ceramic adhesive part 9 at a constant frequency, so that the ink introduction piece 14 swings like a fan via the vibrating piece 13. , continues to be supplied to the ink supply port 11 at a constant pressure. Ink supply port 1
The ink supplied to the pressure chamber 12 via the pressure chamber 12 is jetted by the action of the piezoelectric ceramic bonded to the jetting piezoelectric ceramic bonding section 7. After the ink is ejected, air is sucked into the pressure chamber 12 by the reaction of the ink introduction piece 14.
This is prevented by the applied pressure.

[Effects of the Invention] As described above, the present invention provides an ink introducing piece that swings like a fan on the ink supply port side of the ink chamber, and a piezoelectric for ink introduction that presses and swings the ink introducing piece. By installing ceramics on the outer wall of the ink chamber where the ink is introduced, it is possible to always apply a predetermined pressure in the direction of ink flight.As a result, ink can be supplied smoothly and air can be sucked in from the ink jet port. It has a preventive effect.

Furthermore, by driving the piezoelectric ceramics for introducing ink at a higher voltage than usual at the start of printing, there is an effect that dust and degraded ink attached to the ink ejection port can be ejected.

From the above, the present invention prevents air from being sucked in from the ink jet ports and cleans the ink jets at the start of printing without the need for special equipment such as a vacuum pump, so it is possible to provide a highly reliable ink jet recording device at low cost. There are effects that can be provided.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a printer head of an inkjet recording apparatus according to an embodiment of the present invention. 2 is a perspective view showing the configuration of an inkjet recording device, FIG. 3 is an exploded perspective view of a printer head used in a conventional inkjet recording device, and FIGS. 4 to 6 are a perspective view of the printer shown in FIG. 3. FIG. 3 is a cross-sectional view showing the function of the head. 1: Pressure plate 2: Nozzle plate 3: Supply plate 4: Bypass plate 5: Tank plate 6: Blind plate 7: Piezoelectric ceramic adhesive for jetting 9: Piezoelectric ceramic adhesive for ink introduction piece 10: Ink chamber 11: Ink supply Port 12: Pressure chamber 13: Vibration piece 14: Ink introduction piece

Claims (1)

[Claims] Ink stored in the ink chamber from the ink reservoir is supplied to the pressure chamber via the ink supply port, and the outer wall of the pressure chamber is deflected by piezoelectric ceramics controlled by a pulse generator, and the ink is ejected from the ink jet port. In an inkjet recording device equipped with a printer head that ejects ink in a pressure chamber, an ink introduction piece that swings like a fan is provided in the ink chamber on the side of the ink supply port, and the ink introduction piece is pressed and swings. An inkjet recording apparatus characterized in that a piezoelectric ceramic for an ink introduction piece is provided on an outer wall of the ink chamber at a location corresponding to the ink introduction piece.